White cloud mountain minnow

Water parameters

Tolerated range for this species. Aim for the middle of each band rather than the extremes.

Tank and habitat

Substrate: any.

Behavior

Plant interaction: plant safe.

Feeding

Omnivore that eats anything small enough for its mouth. Flake food, micro pellets, frozen daphnia, frozen brine shrimp, frozen cyclops, and live food. Feeds at the surface and mid-water. Small mouths; crush large flakes. Feed twice daily. Not picky. In outdoor tubs and ponds during summer, they eat mosquito larvae and other aquatic insects without supplemental feeding.

Compatibility

• Cool-water fish that often gets overlooked because tropical tanks dominate the hobby. White clouds do best at 18–22°C, which means an unheated tank or a subtropical setup rather than a standard tropical community at 25–26°C.
• Peaceful and schooling. A group of ten or more shows the best behavior and color, with males sparring and displaying as they compete for females. In small groups they stay pale and skittish.
• Good companions are other cool-water or stream fish: rosy and gold barbs, paradise fish, hillstream loaches, and danios or garra in a stream-style tank. Despite often being sold next to goldfish, they are a poor match for them, since goldfish grow large enough to swallow a 4 cm minnow.
• Sometimes sold as feeder fish, which is a waste. A big school of white clouds in a planted, room-temperature tank is as good a display as any tropical community.

Origin and habitat

Tanichthys albonubes was described by Lin in 1932. The genus name honors Tan Kan Fei, a Chinese scout leader who collected the first specimens and handed them to a local fisheries station, joined to the Greek word for fish; the species name comes from the Latin for white cloud, after the type locality. That type locality is White Cloud Mountain (Baiyun Shan), a cluster of peaks just north of Guangzhou in Guangdong, China, now a tourist resort where the fish appears to be gone. The species sits in the family Tanichthyidae under recent revision, having long been placed in the carp family Cyprinidae. From 1980 to 2001 it went unrecorded in the wild and was feared extinct, after which relict populations turned up near the type locality, in coastal Guangdong, in Quang Ninh province of northeastern Vietnam near Ha Long Bay, and around 2007 on Hainan Island across the Qiongzhou Strait. Genetic study has since shown the species to be a complex of cryptic forms: six new species were described in 2022, splitting populations that had been treated as a single fish. China lists it as a second-class state-protected animal and treats it as endangered, though the IUCN had not assessed it as of recent writing. Adults stay small, about 3 cm to 4 cm in standard length. Ornamental long-finned ('meteor'), golden, albino, and 'super red' strains are bred for the trade, and decades of farm inbreeding have left much hobby stock genetically weak and prone to disease or deformity. The genus was once thought close to Danio or Rasbora, but later work placed its relationships elsewhere among the cyprinoids.

Breeding

An egg-scattering, continuous spawner with no parental care, and one of the simplest egg-layers to breed. Kept as a group in a mature, densely planted tank or an outdoor container, small numbers of fry tend to appear on their own. For a larger yield, a separate dimly lit tank works well: cover the base with mesh, marbles, fine-leaved plants, or a spawning mop so the eggs fall out of the adults' reach, since the parents will eat them given the chance and should be removed after two or three days. Spawning conditions are slightly acidic to neutral water at the warmer end of the fish's range, with gentle aeration. Eggs hatch in roughly 48 to 60 hours; the fry are tiny and take infusoria-grade food at first, then move on to microworm and brine shrimp nauplii as they grow. Outdoor tubs in temperate climates produce fry through the warm months with no intervention, part of why the fish costs so little in shops.

Common problems

Being kept too warm is the main problem. White clouds are cool-water fish, often stocked into heated tropical communities near 26°C where they hang on but lose color, turn sluggish, and live shorter lives; permanent warmth shortens their lifespan. Room temperature around 18°C to 22°C suits them, and many keepers run them with no heater at all. The other issue is stock quality: years of farm inbreeding have produced lines that are genetically weak, more disease-prone, and sometimes deformed, so it pays to pick active, healthy fish from a good source. Kept cool and in a proper school, they are otherwise hardy and forgiving.

Outdoor pond suitability

Climate

temperate

USDA zones

4–10 (winter low around -34°C or warmer)

Outdoor pond at least 60 cm deep for thermal mass. Local frost depth and surface freezing matter.

Bioload

Further reading

• Ich treatment ranked by effectiveness
• How water temperature affects fish metabolism
• Stocking ideas by tank size